JPS6326431B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fire detection device, and an object of the present invention is to provide a novel fire detection device capable of sending a mechanical fire detection signal to a fire protection system to quickly and reliably operate it. That is.

BACKGROUND OF THE INVENTION As cities become more densely populated, the damage caused by fires becomes extremely large, and fire protection systems for buildings are becoming increasingly important. Particularly in hotels, restaurants, etc., many cooking devices such as broilers and fryers are installed and used for large-scale cooking, which inevitably increases the risk of fire outbreak. Therefore, when a fire occurs, it is necessary to install a fire prevention system that immediately cuts off the gas supply to the location where the fire occurred and extinguishes the fire by discharging a fire extinguishing agent, such as carbon dioxide gas, to the location where the fire occurs. In order for the fire protection system to function effectively, it is necessary to generate a fire detection signal that is necessary and sufficient to immediately start operations such as closing the gas valve and opening the extinguishing agent supply valve when a fire occurs. Fire detection equipment is required.

Therefore, the present invention aims to provide a new fire detection device capable of sending out mechanical fire detection signals necessary for operating a fire protection system quickly and reliably, and which uses a single pivot point. The thermofusible material is hung over the rotating ends of the opening/closing body consisting of two plates that rotate around , so that the opening degree remains at a constant angle, and the wire rope is placed on the rotating ends of both plates. The wire rope is movably held at the wire rope, and further stretched over the pivot point, and by applying a tensile force to the wire rope, a force is applied to the opening/closing body in the direction of opening it.

The present invention will be specifically described below with reference to embodiments shown in the accompanying drawings.

1 to 4 show an embodiment of the fire detection device of the present invention, in which a U-shaped plate frame 2 holding the fire detection device 1 of the present invention has holes at the ends of both sides 3, 3. 4, 4 are bored, and the above-mentioned both side pieces 3, 4 are bored in the center part.
A recessed portion 5 is formed which opens on the side where the portion 3 is located.
Reference numeral 6 denotes an opening/closing body held by the plate frame 2, which is composed of two rotating pieces 8, 8 connected to a connecting pin 7. Each of the rotating pieces 8, 8 is formed by bending both ends of a strip plate 9 in opposite directions to form a connecting piece 10 and a hooking piece 11, and cutting out half of the leading end of the connecting piece 10 and forming the remaining end into a cylindrical shape. The pin insertion hole 12 is formed by curling it into a shape. Further, a wire rope guide groove 13 is formed approximately at the center of the bent portion of the connecting piece 10, and a wire rope insertion hole 14 is formed slightly from the center of the hooking piece 11 toward the tip. These two rotating pieces 8,
8 is arranged such that the tip of the connecting piece 10 of one rotating piece 8 is located on the notch surface side of the tip of the connecting piece 10 of the other rotating piece 8.
A connecting pin 7 is inserted through 2 and 12, and they are rotatably connected by the pin 7.

Reference numerals 15, 15 denote temperature fuse holding hooks fixed by welding or the like to the surfaces of the hook pieces 11, 11 on the opposite side of the connecting portion, and the hooks 15, 15 are attached to the hook pieces 16, 16 when the opening/closing body 6 is substantially closed. are fixed so that they face in opposite directions. Reference numeral 17 designates a temperature fuse, in which two high-melting point metal plates each having a hook ring 18 at one end are placed one on top of the other so that the hook rings 18, 18 are located on opposite sides of each other, and are heated to a predetermined temperature, e.g.
It is made by welding with a low melting point metal that melts at 260℃ or 280℃. This temperature fuse 17 is connected to the hook ring 1
8 and 18 are hooked on the temperature fuse holding hooks 15 and 15 of the opening/closing body 6, respectively, so that the rotary pieces 8 and 8 are held so as to maintain their opening at a constant angle. In addition, when hooking one hook ring 18 of the temperature fuse 17 to one hook 15 and then hooking the other hook ring 18 to the other hook 15, the hook of one hook 15 is fixed so that the temperature fuse 17 does not fall off. The piece 16 is made relatively long.

The other end of a pipe fitting 20 consisting of a nut rotatably attached to one end of a cylinder 19 is inserted and fixed into one hole 4 of the plate frame 2, and a wire rope clamper 21 is inserted and fixed into the other hole 4. ing. One end of a pipe 23, through which a wire rope 22 is inserted, is fixed to the pipe fitting 20 by threading the nut into a thread groove formed on the outer periphery of the end. The other end of this pipe 23 is fixed to a starting device, which will be described later. The tip of the wire rope 22 inserted through the pipe 23 is inserted into the wire rope insertion hole 14 of the rotating piece 8 located on the pipe attachment side from the side opposite to the connecting part, and passes through the guide groove 13 to the connecting piece 1.
0 and 10, and is further inserted into the wire rope insertion hole 14 of the other rotating piece 8 from the connecting portion side through the guide groove 13 on the opposite side, and is clamped by the wire rope clamper 21. This wire rope 22 is pulled from the other end with a constant force by a starting device, and the temperature fuse 17
The opening/closing body 6 whose opening degree is restricted to a certain angle by the wire rope 22 receives a force to increase the opening degree by the wire rope 22, and the connecting piece 10 is inserted into the recess 5 provided in the center of the plate frame 2. , 10 are pressed and held in a state where they are in contact and positional displacement is prevented.

In this fire detection device, when the ambient temperature exceeds a predetermined temperature, the low melting point metal that connects the two high melting point metal plates of the temperature fuse 17 melts, and the temperature fuse 1
7 loses the force that restrains the expansion of the opening/closing body 6, so the opening/closing body 6, which had bypassed the wire rope 22 to shorten its substantial length, expands, and the distance over which the wire rope 22 is detoured is shortened. As a result, the actual length of the wire rope 22 becomes longer. Therefore, the occurrence of a fire can be detected based on the change in the actual length of the wire rope 22. As explained above, according to the fire detection device of the present invention, the degree of opening of the opening/closing body, which changes the actual length of the wire rope to be detoured along depending on the degree of opening, is controlled by the thermofusible material. Since it is kept constant, when the thermofusible material melts due to heat, the opening/closing body expands and the actual length of the wire rope changes, so the change in the actual length of the wire rope can prevent a fire from occurring. Can be detected. Furthermore, if a thermofusible material that has high mechanical strength at room temperature is used, it is possible to apply a strong opening force to the opening/closing body using the wire rope, so that when the thermofusible material melts, the wire rope will actually lengthen It becomes possible to quickly and reliably cause a change in the temperature, and a highly reliable fire detection device can be provided.

5 to 8 show an example of a starting device for starting an automatic fire extinguishing operation of an automatic fire extinguishing system using the fire detection device 1 of the present invention, and the starting device 24 is connected to a starting operation section 25 and a lock. 26.

The starting operation part 25 includes a piston 28 and a coil spring 2 that move up and down in a bottomless cylindrical case 27.
It is formed by 9. Bottomless cylindrical case 2
7 is fixed upright on the inner surface of the support casing 30 by appropriate means, and the case 27 has slits 31, 31 on a pair of opposing sides extending from approximately the center and opening at the lower end surface. Furthermore, connecting rod insertion grooves 32, 32, . A piston 28 is fitted into the case 27 so as to be movable up and down, and the piston 28 has a small diameter at the top, a membrane rupture needle 33 protruding from the center of the bottom, and a membrane rupture needle 33 protruding from the side. The tip extends through the slits 31, 31 of the case 27 and connects the case 2.
7 Two king pins 34, 34 that protrude outside
is formed protrudingly. The membrane-rupturing needle 33 has an obliquely notched tip and has a gas passage 35 formed by a hole extending slightly upward from the tip and a hole opening to the outer peripheral surface above the hole. The coil spring 29 is disposed above the piston 28 within the case 27, and its lower end is fitted onto the small diameter portion of the piston 28. 36 is a cylinder mounting block, and mounting holes 37,
Attachment flanges 38, 38 with 37 formed thereon are integrally formed to protrude laterally, and a cylinder attachment hole 39 extending from the center of the bottom surface to a slightly lower part than the upper surface and the hole 3
It has a gas pipe attachment hole 40 extending from the upper part of the gas pipe 9 and opening on the outer surface thereof, and a thread groove is formed on the inner surface of the opening of each of the holes 40, 40, so that a cylinder or a gas pipe can be attached by screwing means. is made possible. 41 is a packing storage recess formed on the upper surface of the cylinder mounting block 36; 42 is the recess 41;
A packing 43 housed in the recess 41 is a membrane-breaking needle insertion hole extending downward from the approximate center of the recess 41 and communicating with the cylinder attachment hole 39 . 44 is a bracket, and a pair of supporting pieces 45, 45 are connected to mounting holes 46, 4.
They are connected by an intermediate piece 47 formed with numbers 6, 46, and 46 to form a U-shape, and a support shaft 48 is supported between the pair of support pieces 45, 45. The cylinder mounting block 36 and bracket 44 are fixed to the lower and upper ends of the case 27 by U-shaped connecting rods 49, 49 having threaded grooves at both ends. That is, the connecting rod 49,
49 through the holes 37, 37, 37, 37 of the mounting flanges 38, 38 of the cylinder mounting block 36,
Connection rod insertion grooves 32, 32, 3 of case 27
2, 32 and mounting holes 46, 4 of the bracket 44
By screwing and tightening the nuts 50, 50, 50, 50 on both ends of the rods 49, 49 protruding from the rods 6, 46, 46, the cylinder mounting block 36 is attached to the lower end of the case 27, and the bracket 44 is attached to the upper end. Each is fixed. In addition, case 2
The position of the membrane rupturing needle 33 fixed to the bottom of the piston 28 in the case 27 and the needle insertion hole 43 of the block 36 is set in advance so that when the block 36 is fixed to the block 7 . Also, by fixing the cylinder mounting block 36 and bracket 44 to the upper and lower ends of the case 27, the piston 28
When the coil spring 29 is raised by operating the king pins 34, 34, the coil spring 29
8 and the bracket 44, and stores the force that causes the piston 28 to collide with the block 36.

The locking section 26 consists of a stopper 51 that directly locks the starting operation of the starting operation section 25, a locking body 52 supported by a bracket 44, a lock releasing body 53, and a pulling section 54. are connected by a connecting piece 56 so as to form a U-shape in plan view, and the rotating pieces 55,
Shaft insertion holes 57, 57 are provided approximately in the center of the rotary pieces 55, 55, and king pins 34, 34 are provided on the opposite side of the lower ends of the rotary pieces 55, 55 from the connection side approximately directly below the shaft insertion holes 57, 57. Hooks 58, 58 for inserting and locking are integrally formed to protrude. In addition,
When the lock kings 34, 34 are locked to the hooks 58, 58, the hooks 58, 58 are attached to the lock king pins 34, 34.
The stopper 51 transfers the rotational force in the direction away from the coil spring 2 through the king pins 34, 34.
9, the pin locking edges 59, 59 of the hooks 58, 58 are formed into slopes that descend from the opposite side toward the tip. Further, engagement pieces 60, 60 are integrally provided upwardly on the slightly connected sides of the upper parts of the rotating pieces 55, 55, and edges 61, 61 on the connection side of the engagement pieces 60, 60
61 is inclined so that as it goes upward, it goes to one side of the connection. 62, 62 are fixed shafts for supporting the stopper 51, and this is connected to the rotating piece 5 of the stopper 51.
5, 55 are inserted into the fixed shaft insertion holes 57, 55, and the tip is inserted into the slit 3 on the outer surface of the case 27.
1 and 31, the stopper 51 is rotatably supported by the case 27. 6
3 and 63 are spacers fitted around the fixed shafts 62 and 62 between the case 27 and the rotating pieces 55 and 55;
This is to allow the stopper 51 to rotate smoothly without coming into contact with the case 27. Reference numeral 64 denotes a torsion coil spring fitted onto the spacer 63, one end of which is locked to the rotating piece 55 of the stopper 51, the other end is locked to the intermediate piece 47 of the bracket 44, and the spring is tightened with hooks 58, 58. kingpin 3
The stopper 51 is biased to rotate in the direction in which the stoppers 4 and 34 are locked, that is, in the direction of arrow B in FIG.
Therefore, the stopper 51 is rotated in the direction of arrow A in FIG.
When the locking pins 4 and 34 are raised to a height at which they can be locked by the hooks 58 and 58, the stopper 51 automatically rotates to an angle at which the locking pins 34 and 34 can be locked by the hooks 58 and 58.

The locking body 52 locks the locking pins 34, 34 with the hooks 58, 58 of the stopper 51, and prevents the stopper 51 from rotating in the direction of arrow A in FIG. 5 in order to keep the starting operation locked. It is rotatably supported by the support shaft 48 of the bracket 44, and of the two rotary ends, the rotary end on the engaging pieces 60, 60 side of the stopper 51 is bent downward at an acute angle to engage the stopper 51. A locking piece 65 is formed which is removable from the pieces 60, 60, and a spring holding pin 66 is formed to protrude upward from the rotation support portion on the opposite side of the locking portion. In addition, the lock body 52 is part 2.
The shaft 48 is inserted into the insertion holes 68, 68 formed in the ear pieces 67, 67 that project upward from both sides approximately in the middle of the two rotating ends, so that the shaft 48 can freely rotate relative to the bracket 44. Supported. 69 is a torsion coil spring fitted onto the support shaft 48, one end of which is connected to the support piece 45 of the bracket 44;
The other end is engaged with a lug 67 of the lock body 52, and the locking piece 65 urges the lock body 52 to rotate in a direction in which it engages with the engaging pieces 60, 60 of the stopper 51. The lock release body 53 presses the opposite side of the lock body 52 from above via the coil spring 70 to release the engaged state between the locking piece 65 of the lock body 52 and the engaging pieces 60, 60 of the stopper 51. It is for rotating the lock body 52 so as to release it, and is rotatably supported by the bracket 44 by the support shaft 48 at one end, and the wire of the fire detection device 1 of the present invention is attached to the rotary end. The ends of the ropes 22 are connected. Furthermore, a long pin insertion hole 71 is formed in a substantially central portion of the lock release body 53 in a direction perpendicular to the rotation axis. In addition, the lock release body 53
When the support shaft 48 is inserted into the insertion holes 73, 73 formed in the support pieces 72, 72, which are provided to protrude downward from a pair of side edges extending in a direction perpendicular to the rotation support shaft 48, It is rotatably supported by a bracket 44. 74 is a rope locking hole formed at the rotating end of the lock release body. The coil spring 70 has a locking body 52 and a locking body 53.
The locking body 5 is held in an externally fitted manner by a spring holding pin 66 between the
2 elastically transmitted.

Reference numeral 54 designates a lock release body for applying a rotational force to the lock release body 53 in the direction of pressing the lock body 52 from above via the coil spring 70 and disengaging the locking piece 65 from the engagement pieces 60, 60 of the stopper 51. The pulling part 54 is connected to a support 75 attached to the housing 30 and an arm 76 rotatably supported by the support 75. It consists of a coil spring 77 and a traction rope 78. Support 75
is fixed to the wall surface of the housing 30 below the lock release body 53, and the arm 7
6 is rotatably supported at a position slightly apart from the wall surface. One end of a coil spring 77 located approximately midway between the rotation end of the arm 76 and the rotation fulcrum is connected, and the other end of a pulling rope 78 connected to the other end of the coil spring 77 is connected to the lock release body 53. It is connected to the locking hole 74. The traction portion 54 then moves the arm 76 to the coil spring 7.
By rotating the arm 76 against the contraction force of the coil spring 77, the rotation end of the arm 76 comes into contact with the wall surface of the casing 30, and the line of action of the contraction force of the coil spring 77 passes between the rotation fulcrum and the wall surface. By allowing the arm 76 to pass through, the rotating end of the arm 76 is kept in contact with the wall surface, and therefore, the contraction force of the coil spring 77 connected to the arm 76 is applied to the rotation of the lock release body 53. It acts to pull the end downward. Note that by rotating the arm 76 in a direction in which its rotating end moves away from the wall surface so that the line of action of the traction force by the coil spring 77 passes through the rotation fulcrum of the arm 76 on the side opposite to the wall surface, the arm 76 can be rotated. Since the coil spring 77 is able to rotate until the contractile force is removed, the pulling state by the pulling portion 54 can be released.

79 is a gas cylinder filled with liquefied carbon dioxide, the mouth of which is sealed with a sealing film 80, and a threaded groove is formed on the outer circumferential surface of the mouth, and the mouth is connected to the cylinder mounting hole. 39, and is thereby attached to the cylinder mounting block 36. 81
is a gas pipe whose one end is connected to a fire extinguishing agent tank of a fire extinguishing system (not shown), and the other end is connected to a gas pipe attachment hole 40.
It is connected to the gas pipe mounting hole 40 of the cylinder mounting block 36 via a gas pipe fitting 82 screwed into the cylinder mounting block 36.

Next, the setting of the activation device 24 will be explained. First, attach cylinder 79 to cylinder mounting block 3.
6, and without pulling the lock release body 53 by the pulling part 54, the lock release body 53, which is in contact with the lock body 52 via the coil spring 70, is slightly rotated toward the side opposite to the lock body to lock it. body 52
The opposite end of the wire rope 22 of the fire detection device 1 of the present invention, which is set at the rotating end of the lock releasing body 53 in that state, is connected to the wire rope connected to the rotating end. 22 so that the unlocking body 53 is maintained at a slight distance from the locking body 52. In this state, the locking pins 34, 34 are connected to the stopper 51.
The locking pieces 65, 65 of the lock body 52 do not engage with the engaging pieces of the stopper 51, but the upper edges 84, 84 of the engaging pieces 60, 60 It is in contact with. Then, the locking pins 34, 34 are raised against the elastic force of the coil spring 29 in the case 27, and when the pins 34, 34 are raised to a height that allows them to be engaged with the hooks 58, 58 of the stopper 51, the hooks are 58 tip edge 83, 83
Since the force that prevents the king pins 34, 34 from rotating against the stopper 51 due to contact with the stopper 51 is removed, the stopper 51 rotates in the direction of arrow B in FIG. 5 due to the biasing force of the torsion coil spring 64.
The locking pins 34, 34 are locked by the hooks 58, 58. At the same time, the engaging pieces 60, 60 of the stopper 52, which were in contact with the locking piece 65 of the lock body 52 at the upper edges 84, 84, also move to a position where they can engage with the locking piece 65. ,
The lock body 52 is rotated by the biasing force of the torsion coil spring 64, and its locking piece 65 engages with the engaging pieces 60, 60 of the stopper 51. Therefore, the lock body 52 prevents the stopper 51 from rotating in the direction of arrow A in FIG. , startup operation section 25
The startup operation is completely locked. Further, the lock body 52 is rotated by the biasing force of the torsion coil spring 69, and the locking piece 65 engages with the engaging pieces 60, 60 of the stopper 51, and at the same time, the lock body 52 is rotated slightly toward the opposite side of the lock body by the wire rope 22. It comes into contact with the lock release body 53, which has been kept in the rotated state, via the coil spring 70. In addition, if the elastic force of the coil spring 29 is extremely strong and it is not possible to raise the locking pins 34, 34 by direct manual operation, use a locking lever 85 as shown in FIG. 9, for example. 2, and raise the king pins 34, 34 by manual operation. This locking lever 85 includes a lever body 88 in which a pair of lever pieces 86, 86 are connected by an intermediate piece 87 to form a U-shape in plan view, and a lever body 88 is rotatably attached to the lever body 88. Pillow board 89 and lever body 88
and a bending handle 90 fixed to the handle. A pair of lever pieces 8 forming a lever body 88
6 and 86 are each provided with a hook that engages with the king pins 34 and 34 at one end opposite to the middle. This locking lever 85 is used, for example, in the following manner. That is, first, the lower end of the pillow plate 89 is brought into contact with the upper surface of the bump mounting block 36 between the protrusion 91 formed upward on the side of the pump mounting block 36 and the case 27, and then the pillow plate 89 is brought into contact with the upper surface of the block 36. With the plate 89 standing slightly upright along the side of the case 27, the bending handle 90 is manually operated to lock the king pins 34, 34 from below with the hooks of the lever pieces 86, 86, and then further operating force is applied. By tightening the force, the king pins 34, 34 are raised against the elastic force of the coil spring 29 inside the case 27. Next, the arm 76 of the traction section 54 is rotated against the contraction force of the coil spring 29 to apply a traction force to the rotation end of the lock release body 53 to which the end of the wire rope 22 is connected. The lock release body 53 that received this traction force
is prevented from rotating toward the lock body 52 by the wire rope 22 connected to its rotating end.
It is maintained close to the lock body 52 as long as it is not pressed and rotated. Thereafter, the cylinder 79 is attached to the cylinder mounting block 36. At this time, the tip of the membrane-rupturing needle 33 formed protruding from the bottom of the piston 28 is set in advance so as to be located slightly above the sealing film 80 of the cylinder 79.

When a fire occurs and the temperature fuse 17 of the fire detection device 1 blows out, the fire detection device that prevents the lock release body 53 from rotating toward the lock body 52 against the traction force of the traction portion 54 Since the actual length of the wire rope 22 becomes longer, the rotation preventing force against the lock release body 53 that resists the above-mentioned traction force is lost, and as a result, the lock release body 53 pushes the lock body 52 against the coil spring 70. It rotates in the direction of pressing through it. Therefore, the locking piece 65 of the lock body 52 separates from the engagement pieces 60, 60 of the stopper 51, and as a result, the stopper 51 is not blocked by the lock body 52 and the coil spring 29
The hooks 58, 58 receive the elastic force through the king pins 34, 34 and rotate in the direction of the arrow A in FIG.
The locking state between the king pins 34 and 34 is released, and the elastic force stored in the coil spring 29 causes the piston 28 to collide with the cylinder mounting block 36, and a cylinder is formed at the bottom of the piston 28. The membrane-rupturing needle 33 pierces the sealing membrane 80 of the cylinder 79. Therefore, the liquefied carbon dioxide sealed in the cylinder 79 flows from the gas passage 35 of the membrane rupture needle 33 to the cylinder attachment hole 39, the gas pipe attachment hole 40, and the gas pipe 8.
1 and ejects to a fire extinguishing device (not shown). FIG. 7 and FIG. 8 show the starting device in a state in which starting operation is performed. The fire extinguishing system is equipped with a sealing film made of aluminum or the like at the joint between the extinguishing agent outlet of the extinguishing agent tank and the pipe leading to the extinguishing agent jet nozzle. When the gas pressure in the tank exceeds a certain value, the sealing membrane is destroyed and the extinguishing agent is ejected from the nozzle through the pipe. When carbon dioxide gas is ejected from the cylinder 79 and enters the tank, the gas pressure in the tank increases and the sealing membrane is destroyed, and the extinguishing agent in the tank is ejected from the nozzle to begin extinguishing the fire.

Fig. 10 shows an example in which the fire detection device 1 of the present invention is installed at a plurality of locations, and when a fire occurs at any one location, the starting device operates to start an automatic fire extinguishing operation. , plate frame 2, 2,
The fire detection devices 1, 1, 1, ... held in ... are connected in series by a wire rope 22 inserted through a pipe connecting them, and each fire detection device 1, 1, 1, ... is connected in series by a wire rope 22 inserted through a pipe connecting them. In the opening/closing body 6, 6,
6,... When the substantial length of the wire rope 22 detoured by... changes due to a change in the opening degree of the opening/closing body 6 based on the melting of the temperature fuse 17 of the fire detection device 1 at the location where the fire occurred. 2
4 performs the startup operation, so even if the temperature fuse 17 of any fire detection device 1 is blown, the automatic extinguishing operation of the fire extinguishing system is started.

[Brief explanation of drawings]

1 to 4 show an example of the fire detection device of the present invention, FIG. 1 is a front view of the fire detection device held in a board frame, FIG. 2 is a perspective view of the opening/closing body, Fig. 3 is a plan view of the temperature fuse, Fig. 4 is a front view of the fire detection device when the temperature fuse is blown, and Figs. 5 to 9 are automatic extinguishing operations of the fire extinguishing system using the fire detection device of the present invention. Fig. 5 is a partially sectional front view showing the set state, and Fig. 6 is an enlarged sectional view taken along line - in Fig. 5. 7 is a partially sectional front view showing a state in which the starting operation has been performed, FIG. 8 is an enlarged sectional view taken along the line - in FIG. 7, and FIG. 9 is a perspective view showing an example of a method for setting the starting device. FIG. 10 is an explanation showing an example of the use of a fire detection device in which a plurality of fire detection devices are connected in series with one wire rope. Explanation of symbols, 1...Fire detection device, 6...Opening/closing body,
7... Pivot point, 8, 8... Plate part, 17... Thermofusible material, 2
2...Wire rope.

Claims (1)

[Claims] 1. Suspend a thermofusible material over the rotating ends of an opening/closing body consisting of two plates that rotate around a single pivot point so as to keep the opening at a constant angle, and also attach a wire rope to both plates. The wire rope is movably held at the rotational end side of the wire rope, and further stretched over the pivot point, and by applying a tensile force to the wire rope, a force is applied to the opening/closing body in the direction of opening it. A fire detection device featuring: